Prediction of long-term stress-rupture life for glass fibre-reinforced polyester composites in air and in aqueous environments

Phillips, M.G.

doi:10.1016/0010-4361(83)90015-0

Cited by 50 publications

(14 citation statements)

References 3 publications

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“…Very few studies on this combined effect were found in the literature. Studies carried out on FRP exposed to an alkaline environment in the presence of loading at various temperatures are limited33,40–46. The stress levels used in these tests exceeded the levels expected at service conditions in order to bring the samples to failure relatively quickly.…”

Section: Review Of Literature On Durability Of Gfrp Reinforcementsmentioning

confidence: 99%

Durability of GFRP bars: a critical review of the literature

Nkurunziza

Debaiky

Cousin

et al. 2005

Progress Structural Eng Maths

168

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The research undertaken during the last two decades has shown that one of the potential solutions to the steel-corrosion-related problems in concrete is the use of fiber-reinforced composite (FRP) reinforcement as a replacement for traditional steel bars. Glass FRP (GFRP) reinforcement is gaining more popularity in construction of bridges and in other concrete structures because of its low cost compared to Carbon FRP reinforcement. The durability of these materials, especially under severe environmental conditions, is now recognized as the most critical topic of research. The lack of data on durability of the GFRP reinforcements is a major obstacle to their acceptance on a broader scale in civil engineering. This paper summarizes the most significant research work published on the durability of FRP bars in the past two decades. A comprehensive review of the literature on the durability of FRP bars indicates a significant increase in the number of studies in this area in the last decade. The durability tests conducted by the authors and others on the latest generation of GFRP bars subjected to stresses higher than the design limits, combined with aggressive mediums at elevated temperatures, have concluded that the strength reduction factors adopted by current codes and guidelines are conservative. These factors were based on limited test results that were carried out on the early generations of the GFRP products, which have now substantially changed.

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Section: Review Of Literature On Durability Of Gfrp Reinforcementsmentioning

confidence: 99%

Durability of GFRP bars: a critical review of the literature

Nkurunziza

Debaiky

Cousin

et al. 2005

Progress Structural Eng Maths

168

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“…Consequently, safety factors in design for long term loading remain high, reflecting a lack of confidence in predictive methods for matrix-dominated behaviour in the presence of water. Phillips [3] has discussed such methods and underlined the problems in extrapolation of short term stress rupture data.…”

Section: Introductionmentioning

confidence: 99%

Influence of water and accelerated aging on the shear fracture properties of glass/epoxy composite

Davies

Pomies²,

Carlsson

1996

Appl Compos Mater

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The degradation of interlaminar shear strength and shear fracture toughness of glass/epoxy composites due to uptake of distilled water and sea water has been studied. The composites were immersed in water for up to eight months at temperatures up to 70 ~ Unreinforced matrix resin samples were also immersed for periods up to 2 years. Sea water was absorbed less rapidly than distilled water. Weight gains below 1% did not influence the shear strength while higher weight gains reduced shear strength up to 25%. The loss in apparent interlaminar shear strength was uniquely related to specimen weight gain. Mode II fracture toughness, Gnc, also decreased with increasing immersion time after an initial incubation period, but the accelerated tests were found to reduce Gn~ less than the room temperature tests at comparable weight gains.

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“…Loading. e degradation of GFRP reinforcing bars could be intensi ed in the presence of a sustained load during conditioning [53][54][55]. ACI 440.1R [2] limits the tensile stress in GFRP under service conditions to 14% of the ultimate tensile strength (UTS), considering the strength reduction factor for environmental exposure.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Microstructure Characteristics of GFRP Reinforcing Bars in Harsh Environment

El-Hassan¹,

El‐Maaddawy²

2019

Advances in Materials Science and Engineering

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Fiber reinforced polymer (FRP) composites have been suggested as corrosion-resistant alternatives to traditional steel reinforcement in concrete structures. Within this family of composites, glass fiber reinforced polymers (GFRPs) have been gaining momentum as the primary selection of FRP for construction applications. Despite being advantageous, its wide adoption by the industry has been hindered due to the degradation of its performance in severe environmental conditions. As such, significant studies have been carried out to assess the mechanical properties of GFRP bars subject to different conditioning schemes. However, the inconsistencies and wide variations of results called for more in-depth microstructure evaluation. Accordingly, this paper presents a critical review of existing research on the microstructure of GFRP reinforcing bars exposed to various conditioning regimes. The review analysis revealed that sustained load limits set by codes and standards were satisfactory for nonaggressive environment conditions but should be updated to include different conditioning regimes. It was also found that conditioning in alkaline solutions was more severe than concrete and mortars, where test specimens experienced irreversible chemical degradation, more hydroxyl group formation, and more intense degradation to the microstructure. The progression of hydrolysis was reported correlatively through an increase in hydroxyl groups and a decrease in the glass transition temperature. While moisture uptake was the primary instigator of hydrolysis, restricting it to 1.6% could limit the reduction in tensile strength to 15%. Further, the paper identifies research gaps in the existing knowledge and highlights directions for future research.

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Prediction of long-term stress-rupture life for glass fibre-reinforced polyester composites in air and in aqueous environments

Cited by 50 publications

References 3 publications

Durability of GFRP bars: a critical review of the literature

Durability of GFRP bars: a critical review of the literature

Influence of water and accelerated aging on the shear fracture properties of glass/epoxy composite

Microstructure Characteristics of GFRP Reinforcing Bars in Harsh Environment

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